News

KalaMango

Favorites 0

My Lists

Sign in to organize and share your saved products.

Basket

Sign in to see items you may have added previously.

See samples, rewards, and promos in your basket.

Cart0

HeatBounce™ Leave-In Conditioner Heat Protectant

554 |
In Stock
Out of Stock
$38.40 $48.00
What it is: A leave-in conditioner with resilicore technology that detangles, softens, and intensely protects hair up to 450 degrees Fahrenheit. Hair
Size
4oz/118ml
4oz/118ml
1.6 oz/47 mL
1.6 oz/47 mL
Add to Wish List
Estimated delivery Oct 20–Oct 25
Free Shipping On all orders
100% Authentic Sephora Verified
Great Value Save more with VIP discounts

K18 Biomimetic Hairscience

What it is: A leave-in conditioner with resilicore technology that detangles, softens, and intensely protects hair up to 450 degrees Fahrenheit.

Hair Texture: Straight, Wavy, Curly, and Coily

Hair Type: Fine, Medium, and Thick

Hair Concerns:
- Dryness
- Heat Protection
- Shine

Key Benefits:
- Protects from heat up to 450 degrees Fahrenheit
- 85 percent less breakage after blow-drying
- Lightweight formula conditions, softens, and detangles even damaged hair

Highlighted Ingredients:
- Resilicore Heat-Shielding Technology: Patented tech for heat protection from cuticle to cortex—more intense than ever.

What Else You Need to Know: Resilicore heat-shielding technology is a breakthrough innovation inspired by resilin—a natural protein that can withstand extreme temperatures. Unlike traditional heat protectants that only coat the cuticle, the size and molecular makeup of Resilicore allows it to penetrate deeper than ever before, into the cortex where heat damage can occur, forming a protective shield that fortifies from within. Created for all hair types and textures. Can be used on extensions.

Clinical Results: In scientific testing with application of K18 HeatBounce and use of 450℉ (232℃) flat iron on dry hair:
- Reduction in hair breakage
- Heat protection up to 450℉/232℃ from the cuticle to cortex

In scientific testing after application HeatBounce on damp hair and exposure to 450℉ (232℃) flat iron on dry hair
- Increase in protein stability
- Heat protection up to 450℉/232℃ from the cuticle to cortex

In scientific testing after application of high-heat blow-dry:
- Reduction in hair breakage
- 85% less breakage

Clean at Sephora
Clean at Sephora is our commitment to offering formulas that go beyond regulatory standards to avoid controversial ingredients without sacrificing effectiveness.

Verified Purchase
1d ago
Another Amazing Addition to K18! 💗✨
I’ve been using this product since the day it launched, and I’m still absolutely obsessed! I use the entire K18 haircare line, and this has been such an amazing addition to my routine. My hair is damaged from bleaching, and this product helps protect it from heat whenever I style it, leaving it softer, smoother, and less frizzy. K18 never disappoints! Definitely worth every penny! 💕
Read more
Liviahirmiz
1d ago
works well but wouldn’t purchase
works well and makes my hair soft, but smells absolutely PUTRID. almost like a mix of used baby wipes and rotten fish…
Read more
CamiSudd
Incentivized
Verified Purchase
6d ago
Not for fine hair
If you have fine hair, don’t waste your money in this product. It’s very heavy and left my hair feeling waxy. I also wasn’t a fan of the smell.
Read more
egatz3333
3w ago
Smell like Rotten Fish
This product horrible!!! I do not recommend. Had to spray hair perfume all over my just washed and styled hair because this stunk so much!
Read more
akemihay
3w ago
Amazing
I love this! I have fine thin hair and it makes my hair so soft. And the heat protection is a bonus!!
Read more
sscooley
Incentivized
4w ago
Not for me
I got a free sample of this. It's a no for me. It made my hair heavy.
Read more
CJiang
Incentivized
Verified Purchase
1mo ago
Eh
For reference-I have a lot of hair but it’s fine. I sprayed the product on and then blow dried. I am not impressed with how it has made my hair feel. It’s made it feel a little heavy, dry, and “waxy”. Seems like it should be a great product. Not sure if I will keep it. As I may sacrifice the feeling of my hair for true heat protection.
Read more
Klc15
1mo ago
Flattens curl
I got this with my birthday bundle. My hair won't hold a curl with it so I suppose it will be only for days I use a straightener. I have tried curling with it multiple times and have been left disappointed. I have thick hair.
Read more
BeachMA
1mo ago
It’s a winner
I have fine thin hair that gets super frizzy and dried out at the ends. This K18 has been a lifesaver. My hair is so soft and shiny. It even works great on the days I air dry. I will definitely be buying a full size.
Read more
SL1458
Verified Purchase
1mo ago
Less is more, leaves hair feeling so good
Absolutely love this stuff. The first time I sprayed it on a section of hair, I sprayed a generous amount and felt a weird film afterwards. I was more conservative with my sprays the second time styling and it felt so hydrating and lightweight. Less is definitely more when it comes to applying this product
Read more
genieboo111

What it is: A leave-in conditioner with resilicore technology that detangles, softens, and intensely protects hair up to 450 degrees Fahrenheit.

Hair Texture: Straight, Wavy, Curly, and Coily

Hair Type: Fine, Medium, and Thick

Hair Concerns:
- Dryness
- Heat Protection
- Shine

Key Benefits:
- Protects from heat up to 450 degrees Fahrenheit
- 85 percent less breakage after blow-drying
- Lightweight formula conditions, softens, and detangles even damaged hair

Highlighted Ingredients:
- Resilicore Heat-Shielding Technology: Patented tech for heat protection from cuticle to cortex—more intense than ever.

What Else You Need to Know: Resilicore heat-shielding technology is a breakthrough innovation inspired by resilin—a natural protein that can withstand extreme temperatures. Unlike traditional heat protectants that only coat the cuticle, the size and molecular makeup of Resilicore allows it to penetrate deeper than ever before, into the cortex where heat damage can occur, forming a protective shield that fortifies from within. Created for all hair types and textures. Can be used on extensions.

Clinical Results: In scientific testing with application of K18 HeatBounce and use of 450℉ (232℃) flat iron on dry hair:
- Reduction in hair breakage
- Heat protection up to 450℉/232℃ from the cuticle to cortex

In scientific testing after application HeatBounce on damp hair and exposure to 450℉ (232℃) flat iron on dry hair
- Increase in protein stability
- Heat protection up to 450℉/232℃ from the cuticle to cortex

In scientific testing after application of high-heat blow-dry:
- Reduction in hair breakage
- 85% less breakage

Clean at Sephora
Clean at Sephora is our commitment to offering formulas that go beyond regulatory standards to avoid controversial ingredients without sacrificing effectiveness.

-Resilicore Heat-Shielding Technology: Patented tech for heat protection from cuticle to cortex—more intense than ever.

Water (Aqua) (Eau), Cellulose Gum, Isopentyldiol, Propanediol , Cetearyl Alcohol, Isopropyl palmitate, Sodium Benzoate, C13-15 alkane, sh-Oligopeptide-78 s-Fruit Fly Oligopeptide-1, (sh-Oligopeptide-78 s-Fruit Fly Oligopeptide-1) Peptides,  Laurdimonium Hydroxypropyl Hydrolyzed Barley Protein, Helianthus Annus (Sunflower) Seed Oil , Oryza Sativa (Rice) Bran Extract, Helianthus Annuus (Sunflower) Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Tocopherol, Behentrimonium Chloride, Brassicatrimonium Chloride, Gluconolactone, Arginine, Coco-Glucoside, Lactic Acid, Cellulose, C12-20 Alkyl Glucoside, Citric acid , Potassium Sorbate, Benzyl Alcohol, Isopropyl Alcohol, C14-22 Alcohols, Fragrance (Parfum), Amyl Salicylate, Benzyl Salicylate, Citronellol, Citrus Aurantium Peel Oil, Dimethyl Phenethyl Acetate, Geraniol, Geranyl Acetate, Isoeugenyl Acetate, Limonene, Linalool, Linalyl Acetate, Pinene, Tetramethyl Acetyloctahydronaphthalenes, Vanillin.

The list of ingredients is subject to change. Please consult the packaging of the product purchased.

Suggested Usage:
- Apply throughout sectioned hair, brushing through to help with even distribution. Less is more. 

- Start small and build as needed. Hair should feel soft and tangle-free, but not coated. 

- Use on towel-dried hair before blow drying and on dry hair before hot tools.

Cart
Your cart is empty
Continue shopping
{{ item.sku_code }} - {{ item.variant_label }} {{ item.item_type_label }}
{{ item.price_format }}
{{ item.subtotal_format }}
Total {{ totalAmount }}
Checkout View Cart